It's not a dumb idea.
Alot of big HP cars do it... It gives one huge advantage too... When you shift, the wastegate is sucked hard shut making ALL exhaust gasses head out the wastegate...
I run my car with no BOV, so if I were to shift, the waste gate is held open, just as is on all cars that run their pressure source from the IC piping as they either run no BOV (And wastegate still sees pressure) or they run a BOV and as such, there is a delay in having the BOV vent, hence there is always a minor amount of pressure... At the least, they see vacuum...
As for claiming it's a dumb idea, you give no reasoning for it...